They're going back 13 billion light years in time to see what happened then because that's how long it took for the light to reach us. But for all we know, as another poster said the universe goes on in infinity, there are probably galaxies a hundred trillion light years away, and farther. My point is, and it's a theory, fifteen billion years for the universe is like a second for us. It's been around a lot longer than that.
I'm sorry; you lost me.
OK, I'll say it in laymen's terms so you can find yourself -IMO, these scientists are blowing hot air and wasting taxpayers money. The universe has been around longer than thirteen billion years, and I don't need 12 years of college education to come to that conclusion.